Pen



FIG. 1 is a front elevational view of a pen showing my new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a perspective view thereof;

FIG. 8 is an exploded view of the pen drawn on a smaller scale and shown without the cap for convenience of illustration; and,

FIG. 9 is a perspective view of the cap drawn on a slightly larger scale and shown without the pen for convenience of illustration.

The broken lines in FIG. 6 and FIG. 8 are included for the purpose of showing portions of the pen that form no part of the claimed design. 

CLAIM The ornamental design for a pen, as shown and described. 